#!/usr/bin/node

const EventEmitter=require('events').EventEmitter,
      log=console.log;
const e=new EventEmitter();

setInterval(()=>{
  e.emit('hello');
},1000);

setTimeout(()=>{
  e.emit;('bye');
},5000);

//事件响应
e.on('hello',()=>{
  log('hello world');
});
e.on('bye',()=>{
  log('goodbye');
  process.exit();
});


